In both the Gaussian and Heaviside Lorentz systems, the electrical and magnetic units are derived from the mechanical systems.
3.
When electric and magnetic systems are defined as in the Gaussian or Heaviside Lorentz systems, derives from the electromagnetic wave equations.
4.
Note that of all these variants, only in Gaussian and Heaviside Lorentz systems \ alpha _ { \ rm L } equals c ^ {-1 } rather than 1.
5.
A key virtue of the Heaviside Lorentz system has these desirable properties as well ( with \ epsilon _ 0 equaling 1 ), but it is a " rationalized " system ( as is SI ) in which the charges and fields are defined in such a way that there are many fewer factors of 4 \ pi appearing in the formulas, and it is in Heaviside Lorentz units that the Maxwell equations take their simplest form.
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